K700 Keyboard - Symbol ]

On the K700 keyboard that came with my Logitech Revue, there are three symbols on one key. The key is the one that contains the closed bracket ]. To the immediate right is the symbol for indicating the approximation of something - at least that's what it was used for in a course on statistics; actually it was two of them, one above the other. So this ] and this } and that third symbol, how does one type it???